Naomi Watts spent the weekend in character as Princess Diana as she worked on her upcoming movie, Caught in Flight, in Croatia. On Saturday, the actress was decked out in a black cocktail dress and jewels to film a scene, and yesterday, she sported a more casual look as she shot on a boat in the waters of Rovinj. On her breaks, Naomi warmed up in a white bathrobe.

We caught a first look at Naomi as Princess Diana on location in London earlier this week. The actress headed to England shortly after the Cannes Film Festival in May to start focusing on her role as the late royal. She took advantage of her stay there to attend Elton John and David Furnish's recent White Tie & Tiara Ball and was decked out in Chopard jewels and a Marchesa dress for the occasion.